如题所述
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1ãint indexOf(String str) ï¼è¿å第ä¸æ¬¡åºç°çæå®åå符串å¨æ¤å符串ä¸çç´¢å¼ã
2ãint indexOf(String str, int startIndex)ï¼ä»æå®çç´¢å¼å¤å¼å§ï¼è¿å第ä¸æ¬¡åºç°çæå®åå符串å¨æ¤å符串ä¸çç´¢å¼ã
3ãint lastIndexOf(String str) ï¼è¿åå¨æ¤å符串ä¸æå³è¾¹åºç°çæå®åå符串çç´¢å¼ã
4ãint lastIndexOf(String str, int startIndex) ï¼ä»æå®çç´¢å¼å¤å¼å§ååæç´¢ï¼è¿åå¨æ¤å符串ä¸æåä¸æ¬¡åºç°çæå®åå符串çç´¢å¼ã
示ä¾
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function IndexDemo(str2){var str1 = "BABEBIBOBUBABEBIBOBU"
var s = str1.indexOf(str2);
return(s);
}
public class FirstDemo {
/**
*APIä¸Stringç常ç¨æ¹æ³
*/
// æ¥æ¾æå®å符串æ¯å¦åå¨
public static void main(String[] args) {
String str1 = "abcdefghijklmnabc";
// ä»å¤´å¼å§æ¥æ¾æ¯å¦åå¨æå®çå符
System.out.println(str1.indexOf("c"));
// ä»ç¬¬å个å符ä½ç½®å¼å§å¾å继ç»æ¥æ¾
System.out.println(str1.indexOf("c", 3));
//è¥æå®å符串ä¸æ²¡æ该å符åç³»ç»è¿å-1
System.out.println(str1.indexOf("x"));
}
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